Hey buddy,
Its Dave, I had the white RS4S with the 34 GTR wheels on the cruise a while ago...
I only take my car to Sabbadin Automotive, never had a complaint in years and years of going there and he has done quite a few different cars on mine. He is trustworthy and a great tuner.
He tuned my PFC in the Stagea as well as do all my other mods.
As others have said you will do no damage with by dropping the drive shaft and pulling the fuse, I did it to mine numerous times and am doing it to my GTR as well.
Call Rob on 9558 4422 tell him Dave sent you!